Periodic Table Questions

Which of the following oxides is amphoteric in character?

In which of the following arrangements the order is NOT according to the property indicated against it?

Identify the incorrect statement among the following:

Which one of the following ions has the highest value of ionic radius?

Among ${\text{Al}}_2{\text{O}}_3,{\text{SiO}}_2,{\text{P}}_2{\text{O}}_3$ and ${\text{SO}}_2$ the correct order of acid strength is:

The formation of the oxide ion ${\text{O}}^{2-}(g)$ requires first an exothermic and then an endothermic step as shown below:
$\text{O}(g)+e^{-}\to {\text{O}}^{-}(g);\Delta H^{\circ }=-142{\text{kJ mol}}^{-1}$
${\text{O}}^{-}(g)+e^{-}\to {\text{O}}^{2-}(g);\Delta H^{\circ }=844{\text{kJ mol}}^{-1}$
The second step is endothermic because:

Of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one?

Which among the following factors is the most important in making fluorine the strongest oxidizing halogen?

Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

The increasing order of the ionic radii of the given isoelectronic species is: